Use of unwrap in core files and improper error handling

[sachindkagrawal15]

Unwrap is usually a shortcut to bypass implementing proper error handling in Rust. Using Unwrap in production code can be dangerous and should be avoided as it crashes the application & hides actual bugs. So, This is highly undesirable in core files and is a Rust bad practice and proper error handling/transmission should be implemented.

Some of Core files in repo where unwrap is used:

1. backend/src/apis/round.rs
2. backend/src/apis/mod.rs
3. backend/build.rs
4. backend/src/contracts/signer.rs
5. zk_prover/benches/full_solvency_flow.rs
6. zk_prover/src/chips/range/range_checks.rs
7. zk_prover/src/circuits/merkle_sum_tree.rs
8. zk_prover/src/merkle_sum_tree/node.rs
9. zk_prover/src/merkle_sum_tree/utils/build_tree.rs
10. zk_prover/src/merkle_sum_tree/utils/operation_helpers.rs